﻿/*
 * [The "BSD license"]
 * Copyright (c) 2011 Terence Parr
 * All rights reserved.
 *
 * Conversion to C#:
 * Copyright (c) 2011 Sam Harwell, Tunnel Vision Laboratories, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

namespace Antlr4.StringTemplate
{
    using System;
    using Path = System.IO.Path;
    using Regex = System.Text.RegularExpressions.Regex;
    using RegexOptions = System.Text.RegularExpressions.RegexOptions;

    public class TemplateName
    {
        private static readonly Regex NameFormatRegex = new Regex(@"^/?([a-z0-9_]+/)*[a-z0-9_]*$", RegexOptions.Compiled | RegexOptions.IgnoreCase);

        private readonly string _name;

        public TemplateName(string name)
        {
            if (name == null)
                throw new ArgumentNullException("name");
            if (name.Length == 0)
                throw new ArgumentException();
            if (!NameFormatRegex.IsMatch(name))
                throw new ArgumentException();

            _name = name;
        }

        public bool IsRooted
        {
            get
            {
                return _name.Length > 0 && _name[0] == '/';
            }
        }

        public bool IsTemplate
        {
            get
            {
                return _name.Length > 0 && _name[_name.Length - 1] != '/';
            }
        }

        public string Name
        {
            get
            {
                return _name;
            }
        }

        public static implicit operator TemplateName(string name)
        {
            return new TemplateName(name);
        }

        public static string GetTemplatePath(string localPathRoot, TemplateName templateName)
        {
            if (!templateName.IsRooted)
                return Path.Combine(localPathRoot, templateName.Name);

            return Path.Combine(localPathRoot, templateName.Name.Substring(1));
        }
    }
}
